Should I get a bitcoin ATM for my cafe? Is it worth it to begin accepting bitcoin?

Ive been into crypto currency for a while now and am opening a modern internet cafe this year. I am toying with the idea of incorporating a one way bitcoin ATM as well as allowing for purchase at the counter using btc as well as cash. I hope to help introduce more people to the freedoms of decentralized currency and blockchain tech and feel as though it would be a unique marketing aspect to boot.

Is it worth it? ATM's are about 6k and many people complain that they are unnecessary. Besides this, i believe another problem would be the difficulties arising in converting the btc to cash afterwards. Im thinking of charging however much say 3$ in btc would be at the moment of purchase, then waiting for a peak to exchange it for cash.

More importantly,any legal problems you guys see with the idea? The cafe will be in Long Branch, New Jersey, a fairly up and coming town.